Improving laminar mixing in a stirred vessel using impeller speed modulations

Low, S, Parthasarathy, R, Wang, J and Wu, J 2010, 'Improving laminar mixing in a stirred vessel using impeller speed modulations', in Dr. Ivan Wichterle (ed.) Proceedings of the 7th European Conference of Chemical Engineering 7 (ECCE-7) and 19th International Congress of Chemical and Process Engineering CHISA 2010, Prague, Czech Republic, 28 August-1 September, 2010, pp. 1-11.


Document type: Conference Paper
Collection: Conference Papers

Title Improving laminar mixing in a stirred vessel using impeller speed modulations
Author(s) Low, S
Parthasarathy, R
Wang, J
Wu, J
Year 2010
Conference name (ECCE-7)
Conference location Prague, Czech Republic
Conference dates 28 August-1 September, 2010
Proceedings title Proceedings of the 7th European Conference of Chemical Engineering 7 (ECCE-7) and 19th International Congress of Chemical and Process Engineering CHISA 2010
Editor(s) Dr. Ivan Wichterle
Publisher Process Engineering Publisher
Place of publication Czech Republic
Start page 1
End page 11
Total pages 11
Abstract Mixing of high viscous liquids at low Reynolds numbers often leadas to inefficient mixing due to the presence of isolated mixing regions (IMRs) formed above and below the impeller. Much research effort has gone in recent years into developing better mixing methods to destroy IMRs. This paper investigates the mixing effects of impeller speed modulation in a Newtonian viscous liquid. The impeller speed modulation was carried out using four different wave forms namely, square, sine, triangle and pulse. Glycerol solution was agitated with a standard six-bladed Rushton turbine in an unbaffled mixing vessel. Direct visualization of an acid-base neutralization reaction with fluorescent green dye was used to measure the mixing time. Digital image analysis was performed to determine the volume of the IMRs at different intervals of the mixing process. Results show that the best mixing performance can be achieved by using square wave modulation. Mixing with pulse, sine wave and triangle wave modulations does help in destroying IMRs. IMRs were still visible after a long period of mixing for the sine wave modulation while they were completely destroyed by other types of modulations.
Subjects Materials Engineering not elsewhere classified
Keyword(s) Chemical engineering
chemistry
Copyright notice © 2010 Èeská spoleènost chemického in-enýrství
ISBN 97880020224800
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